The 25-year-old Frenchman joined Chelsea from Lens in 2007, but was controversially given a four-month ban by FIFA in 2009 for breaching his contract with the French club in order to force a move to Stamford Bridge.

He was also fined £685,000 in the tapping up row and the Blues were also banned from signing any players in the next two transfer windows due to their involvement in persuading him to break his deal.

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BARGAINING TOOL

Celtic could sign Josh Maja this month if he is loaned back to Sunderland

He signed permanently for La Liga side Sevilla in June 2015, but the pacey wideman once again struggled to make his mark and opted to join Hebei China Fortune in February last year.

He has scored two goals in 24 appearances for the Asian outfit, but could be on the way back to Europe - although his high wages are likely to be a stumbling block for potential suitors, which are also thought to include La Liga side Deportivo La Coruna.